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Story

As a college student living away from home, we tend to have friends over pretty often. We decided to create something that could make our apartment look cooler so we searched on Hackster for ideas. We came across a LED light project that we thought was perfect so we decided to do this. These LED's are bought from Adafruit and are programmed to run various functions which display different light sequences depending on the users liking. This is the main difference between our project and others on Hackster. Ours has four "display options" while others have one option with just multiple colors. This is all due to our code. The coding portion was definitely the most difficult portion of the project as this was our first time doing it. After doing the project, we learned that it can be broken down into simpler pieces and is a lot easier.

Photon obtaining photo resistor values

Photon controlling the LED NeoPixel Strip

Our project uses two Photons which send information back and forth to each other. One takes values of a photo resistor and decides whether the lights in the room are on or off. If the lights are off, then it will publish an event through the Particle Cloud where the second Photon picks up the reading. The second Photon, which is controlling the LED strip, then turns on the lights and signals to the first Photon that it was successful where the D7 Board LED turns on.

Photoresistor Circuit Diagram

Code

Code for Controlling the LED Lights

C/C++

This is the code that you should upload to your Photon that controls the LED.

// This #include statement was automatically added by the Particle IDE.#include<neopixel.h>/*------------------------------------------------------------------------- Spark Core, Particle Photon, P1, Electron and RedBear Duo library to control WS2811/WS2812/WS2813 based RGB LED devices such as Adafruit NeoPixel strips. Supports: - 800 KHz WS2812, WS2812B, WS2813 and 400kHz bitstream and WS2811 - 800 KHz bitstream SK6812RGBW (NeoPixel RGBW pixel strips) (use 'SK6812RGBW' as PIXEL_TYPE) Also supports: - Radio Shack Tri-Color Strip with TM1803 controller 400kHz bitstream. - TM1829 pixels PLEASE NOTE that the NeoPixels require 5V level inputs and the Spark Core, Particle Photon, P1, Electron and RedBear Duo only have 3.3V level outputs. Level shifting is necessary, but will require a fast device such as one of the following: [SN74HCT125N] http://www.digikey.com/product-detail/en/SN74HCT125N/296-8386-5-ND/376860 [SN74HCT245N] http://www.digikey.com/product-detail/en/SN74HCT245N/296-1612-5-ND/277258 Written by Phil Burgess / Paint Your Dragon for Adafruit Industries. Modified to work with Particle devices by Technobly. Contributions by PJRC and other members of the open source community. Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! --------------------------------------------------------------------*//* ======================= includes ================================= */#include"Particle.h"#include"neopixel.h"/* ======================= prototypes =============================== */voidcolorAll(uint32_tc,uint8_twait);voidcolorWipe(uint32_tc,uint8_twait);voidrainbow(uint8_twait);voidrainbowCycle(uint8_twait);uint32_tWheel(byteWheelPos);/* ======================= extra-examples.cpp ======================== */SYSTEM_MODE(AUTOMATIC);// IMPORTANT: Set pixel COUNT, PIN and TYPE#define PIXEL_COUNT 145#define PIXEL_PIN D2#define PIXEL_TYPE WS2812B// Parameter 1 = number of pixels in strip// note: for some stripes like those with the TM1829, you// need to count the number of segments, i.e. the// number of controllers in your stripe, not the number// of individual LEDs!// Parameter 2 = pin number (most are valid)// note: if not specified, D2 is selected for you.// Parameter 3 = pixel type [ WS2812, WS2812B, WS2812B2, WS2813, WS2811,// TM1803, TM1829, SK6812RGBW, WS2812B_FAST,// WS2812B2_FAST ]// note: if not specified, WS2812B is selected for you which// is the same as WS2812 or WS2813 in operation.// note: RGB order is automatically applied to WS2811,// WS2812/WS2812B/WS2812B2/WS2813/TM1803 is GRB order.// note: For legacy 50us reset pulse timing on WS2812/WS2812B// or WS2812B2, select WS2812B_FAST or WS2812B2_FAST// respectively. Otherwise 300us timing will be used.//// 800 KHz bitstream 800 KHz bitstream (most NeoPixel products// WS2812/WS2813 (6-pin part)/WS2812B (4-pin part)/SK6812RGBW (RGB+W) )//// 400 KHz bitstream (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)// (Radio Shack Tri-Color LED Strip - TM1803 driver// NOTE: RS Tri-Color LED's are grouped in sets of 3)Adafruit_NeoPixelstrip(PIXEL_COUNT,PIXEL_PIN,PIXEL_TYPE);// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input// and minimize distance between Arduino and first pixel. Avoid connecting// on a live circuit...if you must, connect GND first.voidsetup(){Particle.subscribe("ToddOn008",myHandler);strip.begin();strip.show();// Initialize all pixels to 'off'}voidloop(){// Some example procedures showing how to display to the pixels:// Do not run more than 15 seconds of these, or the b/g tasks// will be blocked.//--------------------------------------------------------------//strip.setPixelColor(0, strip.Color(255, 0, 255));//strip.show();//colorWipe(strip.Color(255, 0, 0), 50); // Red//colorWipe(strip.Color(0, 255, 0), 50); // Green//colorWipe(strip.Color(0, 0, 255), 50); // Blue//rainbow(20);//rainbowCycle(20);//colorAll(strip.Color(0, 255, 255), 50); // Cyan}// Set all pixels in the strip to a solid color, then wait (ms)voidcolorAll(uint32_tc,uint8_twait){uint16_ti;for(i=0;i<strip.numPixels();i++){strip.setPixelColor(i,c);}strip.show();delay(wait);}// Fill the dots one after the other with a color, wait (ms) after each onevoidcolorWipe(uint32_tc,uint8_twait){for(uint16_ti=0;i<strip.numPixels();i++){strip.setPixelColor(i,c);strip.show();delay(wait);}}voidrainbow(uint8_twait){uint16_ti,j;for(j=0;j<256;j++){for(i=0;i<strip.numPixels();i++){strip.setPixelColor(i,Wheel((i+j)&255));}strip.show();delay(wait);}}// Slightly different, this makes the rainbow equally distributed throughout, then wait (ms)voidrainbowCycle(uint8_twait){uint16_ti,j;for(j=0;j<256;j++){// 1 cycle of all colors on wheelfor(i=0;i<strip.numPixels();i++){strip.setPixelColor(i,Wheel(((i*256/strip.numPixels())+j)&255));}strip.show();delay(wait);}}// Input a value 0 to 255 to get a color value.// The colours are a transition r - g - b - back to r.uint32_tWheel(byteWheelPos){if(WheelPos<85){returnstrip.Color(WheelPos*3,255-WheelPos*3,0);}elseif(WheelPos<170){WheelPos-=85;returnstrip.Color(255-WheelPos*3,0,WheelPos*3);}else{WheelPos-=170;returnstrip.Color(0,WheelPos*3,255-WheelPos*3);}}voidmyHandler(constchar*event,constchar*data){/* Particle.subscribe handlers are void functions, which means they don't return anything. They take two variables-- the name of your event, and any data that goes along with your event. In this case, the event will be "buddy_unique_event_name" and the data will be "intact" or "broken" chars just don't play that way. Instead we're going to strcmp(), which compares two chars. If they are the same, strcmp will return 0. */if(strcmp(data,"on")==0){// if your photoresistor detects the lights are not on, turn on the LED's and publish event saying successcolorWipe(strip.Color(255,0,0),50);// Redstrip.show();Particle.publish("SeanSuccess008","On");}elseif(strcmp(data,"off")==0){Particle.publish("SeanSuccess008","Off");colorAll(strip.Color(0,0,0),50);// Cyan// if the data is something else, don't do anything.// Really the data shouldn't be anything but those two listed above.}}

Code for Reading Photoresistor Values and Publishing

C/C++

This is the code that should be uploaded to the Photon which takes the photo resistor values.

intboardLed=D7;intphotoresistor=A0;intpower=A5;intanalogvalue;boolon;// We start with the setup function.voidsetup(){// This part is mostly the same:pinMode(boardLed,OUTPUT);// Our on-board LED is output as wellpinMode(photoresistor,INPUT);// Our photoresistor pin is input (reading the photoresistor)pinMode(power,OUTPUT);// The pin powering the photoresistor is output (sending out consistent power)digitalWrite(power,HIGH);boolon=false;//set lights to off to start// Here we are going to subscribe to your buddy's event using Particle.subscribeParticle.subscribe("SeanSuccess008",myHandler);// Subscribe will listen for the event buddy_unique_event_name and, when it finds it, will run the function myHandler()// (Remember to replace buddy_unique_event_name with your buddy's actual unique event name that they have in their firmware.)// myHandler() is declared later in this app.// Next, write the power of the photoresistor to be the maximum possible, which is 4095 in analog.}voidloop(){intanalogvalue=analogRead(photoresistor);if(analogvalue<40&on==false){Particle.publish("ToddOn008","on");Particle.publish("photoResistorValue","on");on=true;}elseif(analogvalue>40&on==true){Particle.publish("ToddOn008","off");on=false;}delay(1000);}// Now for the myHandler function, which is called when the cloud tells us that our buddy's event is published.voidmyHandler(constchar*event,constchar*data){if(strcmp(data,"On")==0){digitalWrite(boardLed,HIGH);}else{digitalWrite(boardLed,LOW);}}ToddGunzenhauser11:06PM(1minuteago)toSean// Initializing all variablesintboardLed=D7;intphotoresistor=A0;intpower=A5;intanalogvalue;boolon;// Setting up all the important stuff ya know?voidsetup(){pinMode(boardLed,OUTPUT);// Our on-board LED is output as wellpinMode(photoresistor,INPUT);// Our photoresistor pin is input (reading the photoresistor)pinMode(power,OUTPUT);// The pin powering the photoresistor is output (sending out consistent power)digitalWrite(power,HIGH);boolon=false;// Set lights to off to start// Subscribing to Sean's PhotonParticle.subscribe("SeanSuccess008",myHandler);}voidloop(){intanalogvalue=analogRead(photoresistor);if(analogvalue<100&on==false){Particle.publish("ToddOn008","on");Particle.publish("photoResistorValue",String(analogvalue));on=true;}elseif(analogvalue>100&on==true){Particle.publish("ToddOn008","off");Particle.publish("photoResistorValue",String(analogvalue));on=false;}delay(2000);}// When Sean's Photon does stuff it sends it herevoidmyHandler(constchar*event,constchar*data){// if he tells me to turn my light on then I turn it on.